EP 0001999 B1 19801210 - PROCESS FOR OBTAINING MALEIC ANHYDRIDE FROM DESTILLATION RESIDUES
Title (en)
PROCESS FOR OBTAINING MALEIC ANHYDRIDE FROM DESTILLATION RESIDUES
Publication
Application
Priority
DE 2750284 A 19771110
Abstract (en)
[origin: US4219388A] A process for the recovery of maleic anhydride from distillation residues containing the same is described whereby a residue containing phthalic anhydride is added to the residue of maleic anhydride prior to or after distillation of the maleic anhydride residue. By such a process maleic anhydride recovery is improved and the distillation residue remaining from distillation of the maleic anhydride out of the maleic anhydride residue remains removable by simple mechanical means from the distillation vessel.
IPC 1-7
IPC 8 full level
C07C 51/44 (2006.01); C07D 307/60 (2006.01); C07C 51/573 (2006.01)
CPC (source: EP US)
C07C 51/44 (2013.01 - EP US); C07C 51/573 (2013.01 - EP US)
C-Set (source: EP US)
Designated contracting state (EPC)
BE DE FR GB NL
DOCDB simple family (publication)
EP 0001999 A1 19790530; EP 0001999 B1 19801210; DE 2750284 A1 19790517; DE 2860309 D1 19810219; IT 1109267 B 19851216; IT 7851818 A0 19781108; JP S5476520 A 19790619; JP S6019756 B2 19850517; US 4219388 A 19800826
DOCDB simple family (application)
EP 78101261 A 19781028; DE 2750284 A 19771110; DE 2860309 T 19781028; IT 5181878 A 19781108; JP 13685078 A 19781108; US 95528278 A 19781026